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定义感知:我们把顶点关于y轴对称,且交于y轴上同一点的两条抛物线叫做“孪生抛物线”,如图所示的抛物线y1=x2+2x+2与y2=x2﹣2x+2是一对“孪生抛物线”.初步运用:(1)判断下列论断是否正...
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教案备课库《2018-2019学年九年级上学期数学国庆作业(一)》真题及答案
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